嘿，我在Android领域还很陌生，无法从主活动中打开另一个活动。
主类：
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.HashMap;
import layout.SongsPage;
public class MainActivityFragment extends Fragment {
ListView listView;
HashMap<String, String> songs;
Singer[] singeres=new Singer[4];
public Singer[] getSingeres() {
singeres[0]=new Singer("Dave Brubeck",1);
singeres[0].AddingSong("Take Five","http://bff.vr2.net/jazz/Dave%20Brubeck%20Quartet%20featuring%20Paul%20Desmond%20-%20Buried%20Treasures%20()/07%20%20-%20Take%20Five.mp3");
singeres[1]=new Singer("Jefferson Airplane",2);
singeres[1].AddingSong("White Rabbit", "http://bff.vr2.net/jazz/Dave%20Brubeck%20Quartet%20featuring%20Paul%20Desmond%20-%20Buried%20Treasures%20()/07%20%20-%20Take%20Five.mp3");
singeres[2]=new Singer("2Pac",3);
singeres[2].AddingSong("Revolution","http://bff.vr2.net/jazz/Dave%20Brubeck%20Quartet%20featuring%20Paul%20Desmond%20-%20Buried%20Treasures%20()/07%20%20-%20Take%20Five.mp3");
singeres[3]=new Singer("Mr. Probz",4);
singeres[3].AddingSong("Waves","http://bff.vr2.net/jazz/Dave%20Brubeck%20Quartet%20featuring%20Paul%20Desmond%20-%20Buried%20Treasures%20()/07%20%20-%20Take%20Five.mp3");
return singeres;
}
Singer[] Getsingeres=getSingeres();
public MainActivityFragment() {
songs = new HashMap<>();
songs.put("Dave Brubeck - Take Five",
"http://bff.vr2.net/jazz/Dave%20Brubeck%20Quartet%20featuring%20Paul%20Desmond%20-%20Buried%20Treasures%20()/07%20%20-%20Take%20Five.mp3");
songs.put("Jefferson Airplane - White Rabbit", "http://www.rraurl.com.br/media/musica/tracks/Jefferson%20Airplane%20-%201967%20-%20Surrealistic%20Pillow%20-%2010%20-%20White%20Rabbit.mp3");
songs.put("2Pac - Revolution","http://thug2pac.narod.ru/mp3/Phenomeno/02_Revolution_www.thug2pac.narod.ru.mp3");
songs.put("Mr. Probz - Waves", "http://mp3light.net/assets/songs/393000-393999/393222-waves-mr-probz.mp3");
for(int i=0;i<singeres.length;i++){
songs.put(Getsingeres[i].name,"http://bff.vr2.net/jazz/Dave%20Brubeck%20Quartet%20featuring%20Paul%20Desmond%20-%20Buried%20Treasures%20()/07%20%20-%20Take%20Five.mp3");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.fragment_main, container, false);
listView = (ListView) v.findViewById(R.id.listView);
listView.setAdapter(new ArrayAdapter<String>(
getActivity(),
R.layout.listview_item,
R.id.textView,
songs.keySet().toArray(new String[songs.keySet().size()])));//keySet=key
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//starting the mediaPlayer Activity with the song url
Intent intent = new Intent(getActivity(), SongsPage.class);
**startActivityForResult(intent, 1);**
//getActivity().overridePendingTransition(android.R.anim.slide_in_left, android.R.anim.fade_out);
}
});
return v;
}
@Override
public void onResume(){
super.onResume();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
getActivity();
if(resultCode == -1){
Toast.makeText(
getActivity(),
"can't play that song",
Toast.LENGTH_LONG).show();
}
}
}
SongsPage类：
package layout;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.telhai.eiran.mediaplayer.R;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link SongsPage.OnFragmentInteractionListener} interface
* to handle interaction events.
*/
public class SongsPage extends Fragment{
private OnFragmentInteractionListener mListener;
public SongsPage() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_songs_page, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
当我单击主页上的歌曲时，它在手机上显示错误提示
“很遗憾，[项目名称]已停止”
当我调试时，我发现问题出在哪里 startActivityForResult(intent, 1);
有人可以帮忙吗？
您正在尝试打开一个片段而不是一个活动。
片段是声明的类，可以存在于Activity中，如果您在其他Activity中也需要它们，则可以重用。片段是可以放在活动中的应用程序用户界面或行为的一部分，但是没有活动就无法实例化片段。
为了在Activity中实现一个Fragment，只需在Activity中的容器中进行类似的事务即可：
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
YourFragment frag = new YourFragment ();
ft.replace(R.id.container_for_fragment, frag);
ft.commit();
如果您不希望使用Fragment，只需将SongsPage类更改为Activity。在这种情况下，请不要忘记在清单中声明它。或者，如果您确实需要它作为片段，请参考this。
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